royal blue

American  

noun

1. a deep blue, often with a faint reddish tinge.

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royal blue British  

noun

1. 1. a deep blue colour

   2. ( as adjective )

      a royal-blue carpet

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Etymology

Origin of royal blue

First recorded in 1810–20

Compare meaning

How does royal-blue compare to similar and commonly confused words? Explore the most common comparisons:

• cobalt blue vs. royal blue
• cobalt vs. royal blue

Example Sentences

In the video, Sides can be seen wearing a royal blue ballroom dancing outfit she has owned since becoming a professional dancer in 1988.

From BBC • Feb. 18, 2026

The vessels are glazed a deep, glossy royal blue.

From The Wall Street Journal • Oct. 1, 2025

To achieve that, Cardinals turf manager Andy Levy arranged for 200 gallons of paint in the Rams’ royal blue and sol yellow to adorn the field and end zones.

From Los Angeles Times • Jan. 13, 2025

Then the director introduced Megan, regally dressed in a royal blue silk gown and sporting an updo.

From Salon • Nov. 1, 2024

Each story was preceded by a detailed illustration, hand-painted in royal blue and crimson, silver and gilt.

From "Ash" by Malinda Lo